The folks at my local brickyard, as many of you have indicated in other posts, were almost completely oblivious to the differences between the different types of firebricks (low-medium-high duty). However, they were able to provide me with an MSDS-type information sheet ... WOOT

Anyways, these bricks are comprised of only 16% Al2O3 (alumina?), and I have read that the target alumina amount should be closer to 30%. Can anyone tell me if these bricks will work well in my hearth and dome?

Nah, I tend to ask questions on this forum that no one wants to / is able to answer ... Since posting this question, I have finished my oven with the lower alumina-content firebricks (dome and hearth) and they have worked fantastically! The oven takes a long time to heat up, but stays hot all that day and night.

Matt, there was a brick company in bacchus marsh that no longer makes bricks, and they had been making mostly 26% bricks for 100 years, all suitable for WFO's. They even made a dense brick in 18% which would have been ideal. Go with the bricks mate.

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